The spectrometer for the GunLab experiment is described. This spectrometer incorporates a dipole magnet, a fluorescent screen, and a CCD camera and is designed to measure the momentum of electron beams in the range of 1–10 MeV/c with a resolution of 0.1%. If a transversely deflecting RF cavity is installed in front of the dipole magnet, one may investigate the ongitudinal phase portrait of a beam. The spectrometer is distinctive in that a Hall sensor is placed in the magnetic field of the dipole magnet. This sensor allows one to accurately measure the magnetic field and, consequently, the momentum of an electron beam.
$^1$Department of Physics, Moscow State University, Moscow, 119991 Russia
$^2$Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119991 Russia
$^3$Institute for Accelerator Physics, Helmholtz-Zentrum Berlin for Materials and Energy, 12489 Berlin, Germany
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